My old dog's inverted nipple is sore and looks like it's closing up. What should I do?

You can use a clean washcloth to gently remove any debris and keep the nipple clean. Monitoring the puppies and moving them to a different nipple when they try to nurse is also best to help the area heal. If it becomes infected, oozing debris, smelling, red and hot to the touch, etc, it needs to be seen by a vet to be more thoroughly cleaned and treated with antibiotics.

Poor girl. Because this mass is open and seems to be bothering her I would highly consider having this mass removed surgically. Sometimes if the mass is small (less than 2 cm's) we can do a sedative on the pet and quickly remove these. However if it is a larger mass then general anesthesia may be required. She also needs to be placed on oral antibiotics to keep this area from getting infected and daily cleaning of the mass as well. Sterile saline flushes can help keep this area relatively clean and then an e-collar placed on her can help prevent licking. If surgery isn't an option for you, then medical management with antibiotics, e-collar and regular cleanings may allow proper healing of the area, but in most cases surgical removal is the best option. Best of luck!

This looks like a mild skin infection/inflammation. I suggest you use these medicated pads on it. If after about a week to 10 days of use, the lesion is not better or looks worse then your vet should examine him. ( https://www.allivet.com/p-5393-douxo-chlorhexidine-3-ps-pads-for-dogs-and-cats-30.aspx )

This seems to be a superficial skin abrasion with an infection building up. Disinfection can be provided back with hibiscrub (1:10 water solution) twice daily but possibly antibiotics will be needed.

I don't think this looks too concerning but if you are worried you should take him to your vet for an exam. If you want to try something on him at home, I would suggest you try this product. If no improvement with using this then he should definitely see your vet. ( https://www.petco.com/shop/en/petcostore/product/vetericyn-plus-hot-spot-antimicrobial-gel-for-dogs )

I am sorry to hear about Archie. Possible causes for this could include infection, abscess, or tumor. Unfortunately none of these causes are really treatable with at home care. If the area is growing rapidly, is painful or hot to the touch, or your dog is lethargic/not eating/uncomfortable then these are signs he should be seen right away. If he seems unbothered by the area and it isn't growing rapidly, you could try applying warm compresses for 10 minutes a few times a day. If it is an abscess this may help it come to a head and drain. Clean around the nipple well with a mild soap or antiseptic such as Hibiclens in case there is a superficial infection and apply a topical antibiotic such as Polysporin. If the area isn't getting smaller or is increasing in size, then vet care is needed. You may consider seeing if there is a low-cost vet clinic in your area. Some Humane Societies/Animal Protection Leagues/etc. have low-cost clinics for those who cannot afford a full service veterinarian. You can get more ideas on paying for vet care at http://m.humanesociety.org/animals/resources/tips/trouble_affording_veterinary_care.html

Ouch, poor Omi! Gently wash the wound warm water and antiseptic soap. To keep her from licking at it, you can put an Ecollar on her. You can get one at a pet store or make one at home. Keep the wound clean and dry, and monitor it for signs of infection. If you see redness, swelling, warmth to the touch, or pus, then it is infected and she will need to see the vet for antibiotics to treat it. I hope this helps!